who can fix windows movie maker? (Dubai)

I am having non stop problems with Windows Movie Maker Protected content . It used to work 3 weeks a go now it doesn't. Everytime I try to save to computer it crashes, and now it even crashes when I drag and drop an AVI file on there. I am using windows 7 ultimate.I have tried the following but no luck....

- repairing windows essentials- lowering the compatibility in properties of movie maker file-using Microsoft fix it tool-using correct file formats-updated adapter driver and deleted possible drivers etc that may confict-my system restore points only allow me to restore to earlier today, so cannot undo my system updates much now

I know there's a compatibility issue somewhere, or a windows update has caused a confliction because the software was working fine a few weeks ago.